使用JSP下载文件 [英] Using JSP to download a file

问题描述

我目前正在尝试使用JSP构建一些小型的litle应用程序，并且没有陷入困境，从Web服务器下载文件。我似乎无法弄清楚我应该如何完成这项任务。

I am currently trying to use JSP to build some small litle apps and have not got stuck on something, downloading files from a webserver. I just cant seem to work out how I should go about this task.

这里是否有任何JSP开发人员知道如何解决这个问题并指出我正确的方向？

Are there any JSP developers here who know to go about this and could point me in the right direction?

推荐答案

如果资源是静态的，只需将其放入公共webcontent（您的JSP / HTML / CSS / JS所在的位置） / etc文件也是）并在JSP中包含指向它的链接。

If the resource is static, just put it in the public webcontent (there where your JSP/HTML/CSS/JS/etc files also are) and include a link to it in your JSP.

<a href="file.ext">download</a>

servletcontainer会担心设置正确的HTTP响应标头。

The servletcontainer will worry about setting the right HTTP response headers.

如果资源是动态的，创建一个servlet，以某种方式获取内容的 InputStream （ new FileInputStream ， resultSet.getBinaryStream（），etc..etc ..）并将其写入 OutputStream 的至少响应 Content-Type 和 Content-Disposition 响应标头。最后，只需链接到JSP中的servlet。

If the resource is dynamic, create a servlet which obtains an InputStream of the content somehow (new FileInputStream, resultSet.getBinaryStream(), etc..etc..) and writes it to the OutputStream of the response along at least the Content-Type and Content-Disposition response headers. Finally just link to that servlet in your JSP.

<a href="fileservlet/file.ext">download</a>

您可以在这篇文章。

Content-Type 标题通知客户端文件的内容类型，以便它知道应该使用什么应用程序来打开它。 Content-Disposition 标题通知客户端如何处理，内联显示或保存为附件。

The Content-Type header informs the client about the content type of the file so that it knows what application it should use to open it. The Content-Disposition header informs the client what to do with it, displaying it inline or saving as attachment.

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